class_docstr: Testing suite for Audio models - tests all the tests defined in `BetterTransformersTestMixin`
code: def prepare_inputs_for_class(self, model_id, model_type):
      batch_duration_in_seconds = [1, 3, 2, 6]
      input_features = [
          np.random.random(16_000 * s)
          for s in batch_duration_in_seconds
      ]
  
      feature_extractor = AutoProcessor.from_pretrained(
          model_id, return_attention_mask=True
      )
  
      input_dict = feature_extractor(
          input_features, return_tensors="pt", padding=True
      )
      return input_dict
  
imports: import unittest
  import numpy
  import pytest
  import torch
  from parameterized import parameterized
  from testing_utils import MODELS_DICT, BetterTransformersTestMixin
  from transformers import AutoModel, AutoProcessor, set_seed
  from optimum.bettertransformer import BetterTransformer
  from optimum.utils.testing_utils import grid_parameters, require_torch_gpu
label_desc: Use image node_id 1 for calling the BetterTransformersAudioTest obj's underlying member method code with example usage: obj.prepare_inputs_for_class(model_id, model_type) and returns: input_dict